.GIF no animation?

I'm having some trouble placing a .gif picture; the thing is that it's not animating.
I went through several discussions where this problem is exposed and mostly the answer was "make it fullpx" what I did but it didn't work.
I then tried many things like placing like adding it using HTML in the text part, it actually worked, the image was showing except it was right after my text and I'm using Horizontal format for my website (and it does not resolve the problem anyway), placing it manually, renaming it...